kernel/cgroup/cpuset.c

1339 static int update_partition_exclusive(struct cpuset *cs, int new_prs)
1341 	bool exclusive = (new_prs > 0);
1362 	int new_prs = cs->partition_root_state;
1363 	bool rebuild_domains = (new_prs > 0) || (old_prs > 0);
1370 	if (new_prs > 0) {
1371 		new_lb = (new_prs != PRS_ISOLATED);
1428  * @new_prs: new partition_root_state
1431 static void partition_xcpus_newstate(int old_prs, int new_prs, struct cpumask *xcpus)
1433 	WARN_ON_ONCE(old_prs == new_prs);
1434 	if (new_prs == PRS_ISOLATED)
1442  * @new_prs: new partition_root_state
1449 static bool partition_xcpus_add(int new_prs, struct cpuset *parent,
1454 	WARN_ON_ONCE(new_prs < 0);
1463 	isolcpus_updated = (new_prs != parent->partition_root_state);
1465 		partition_xcpus_newstate(parent->partition_root_state, new_prs,
1566  * @new_prs: new partition_root_state
1573 static int remote_partition_enable(struct cpuset *cs, int new_prs,
1599 	isolcpus_updated = partition_xcpus_add(new_prs, NULL, tmp->new_cpus);
1814 	int old_prs, new_prs;
1824 	 * new_prs will only be changed for the partcmd_update and
1828 	old_prs = new_prs = cs->partition_root_state;
1843 			new_prs = -old_prs;
1873 		if (prstate_housekeeping_conflict(new_prs, xcpus))
1886 		new_prs = (cmd == partcmd_enable) ? PRS_ROOT : PRS_ISOLATED;
1896 		new_prs = PRS_MEMBER;
2007 				new_prs = -old_prs;
2014 				new_prs = -old_prs;
2021 	if (!adding && !deleting && (new_prs == old_prs))
2030 	if ((old_prs != new_prs) && (cmd != partcmd_update))  {
2031 		int err = update_partition_exclusive(cs, new_prs);
2045 	if (old_prs != new_prs) {
2046 		cs->partition_root_state = new_prs;
2047 		if (new_prs <= 0)
2058 		isolcpus_updated += partition_xcpus_add(new_prs, parent,
2068 	if ((old_prs != new_prs) && (cmd == partcmd_update))
2069 		update_partition_exclusive(cs, new_prs);
2180 	int old_prs, new_prs;
2207 		old_prs = new_prs = cp->partition_root_state;
2281 					new_prs = -cp->partition_root_state;
2299 			new_prs = cp->partition_root_state;
2304 		cp->partition_root_state = new_prs;
2309 		if ((new_prs > 0) && cpumask_empty(cp->exclusive_cpus))
2312 		else if (new_prs < 0)
3030  * @new_prs: new partition root state
3035 static int update_prstate(struct cpuset *cs, int new_prs)
3042 	if (old_prs == new_prs)
3048 	if (new_prs && is_prs_invalid(old_prs))
3058 	if ((new_prs > 0) && cpumask_empty(cs->exclusive_cpus)) {
3065 	err = update_partition_exclusive(cs, new_prs);
3070 		enum partition_cmd cmd = (new_prs == PRS_ROOT)
3086 		if (err && remote_partition_enable(cs, new_prs, &tmpmask))
3088 	} else if (old_prs && new_prs) {
3115 		new_prs = -new_prs;
3116 		update_partition_exclusive(cs, new_prs);
3120 	cs->partition_root_state = new_prs;
3125 		partition_xcpus_newstate(old_prs, new_prs, cs->effective_xcpus);
3130 	update_cpumasks_hier(cs, &tmpmask, !new_prs ? HIER_CHECKALL : 0);